Separable fastener



April 1931- M. BLASKOPF 1,799,210

SEPARABLE FASTENER Filed July 3, 1929 //V V[ N TOR /70X B/a ko of ATTUR/l/E) Patented J Apr. 7, 1931 UNITED STATES MAX BLASKOPF, OF VIENNA,AUSTRIA SEPARABLE FASTENER Application filed July 3, 1929, Serial No.375,804, and in Austria August'.30, 1928. v

This invention relates to improvements in separable fasteners of thekind comprising material lengths carrying longitudinally disposed seriesofinterlocking units and a slider adapted to cause the units to engageand disengage, However the fasteners of this kind, when used inconnection with garments, boots, gloves or the like, possess thedrawback, that the connection between the units to be engaged with oneanother is too rigid and inflexible, thereby rendering disagreeabletheir use. The reason for this inflexibility resides in the fact thatthe units are attached, as a rule, to the strengthened bor- 5 ders ofstrong and inelastic material length, which are secured to the parts tobe engaged with one another. As a matter of fact, the flexible unitshave to be secured to a material length which is inelastic in thelongitudinal direction, because otherwise the units could automaticallydisengage themselves. This is the reason why up to now it has not beentaken into consideration to impart to the fastener the flexibilitynecessary when used in connection with certain garments.

An object of the present invention is to provide the fastenerconnectedwith the two parts of the object with. the necessary flexibility in thatthe length carrying the units are inelastic in the longitudinaldirection but elastically extensible in the transverse direction of thefastener-slit.

Some modes of carrying out the present invention are illustrated by wayof example on the accompanying sheet of .drawmgs. I

Figs.'1,2 and 3 show in front elevation three embodiments of theinvention.

Fig. 4 illustrates a cross section on line m -n of Fig. 3. Figs. 5 and 6show two further embodlments of, the invention in cross section.

In. the embodiment of the invention illustrated in IN 1 the*materialiengths 1 provided on their edges 2 with the interlocking units3 are elastic in the transverse direction,

that is to say transversely to the slits between the two series of unitsbut inelastie in the longitudinal direction. These lengths may consistof a web in whlch the threads w to extending in the longitudinaldirection are made of an inelastic material as for instance of yarn,while the threads y extending in the transverse direction are made of anelastic material. as for instance rubber, contrary to the common rubberbands used for various objects which are elastic in the longitudinaldirection, but inelastic in the transverse direction. The lengths 1 actas an elastic intermediate member between the interlocking units 3 andthe parts of the object to be closed.

The outer edges of the lengths 1 may be provided with suitable inelasticstrengthening strips in order to provide a firm connection between thesaid lengths and the parts of the object to be interlocked. The cordforming the edge 2 and carrying the interlocking units 3 is secured tothe length 1 in any convenient manner, for instance the web forming thelength I may be passed around and sewn to the cord 2.

It is not necessary that the length 1 is elastic over its entire width.As shown in Fig. 2 only a part 6 of the width may be elastic, so thatthe length comprises for instance two (5 inelastic strips i i and astrip e elastic only in the transverse direction. Also a number of suchstrips may be provided. The threads of the inelastic strip are formed byyarn, while in the elastic strip the threads extending in. thetransverse direction are constituted by rubber strings. A combinedfabric of this kind can made in a single piece or the individual stripsmay be interconnected in any convenient manner. 55

In the embodiment shown in Figs. 3 and 4 (plan view and cross-sectionalview respectively) the length comprises a solid rubber strip 1', inwhich is embedded at one border the cord 2 while the opposite bordercarries a strengthening strip 5 of linen or the like through whlch passthe means connecting the length with the parts of the object providedwith the fastener. Strengthening strips of this kind may be arranged inany convenient manner also on the outside of the length and also thecord 2 may be secured to the rubber strip 1' in any other manner than byway of embedding.

Figs. 5 and 6 show two further embodiments of the invention in which thestrip of inelastic web is formed by folding a broad strip 2'. Betweenthe two layers of this strip an elastic strip a is secured. In theembodi- 5 meet illustrated in Fig. 5, two cords 2 are secured at theoutside for the attachment of the units while in the construction shownby Fig. 6 one cord 2 is enclosed in and sewn to the folded strip 71.Also two separate strips sewn together may form the two layers.

Of course the subject matter of the invention may be carried out also invarious manner without departing from the scope of the presentinvention. I claim:

1. Separable fastener comprising two material lengths fixed on themargins of which the fastener is applied, which are inelastic in thelongitudinal but elastic in the transverse direction, interlocking unitsarranged in series upon the edge of each length and a slider adapted toengage and disengage the units of the two lengths.

2. Separable fastener comprising two material len ths of web fixed onthe margins of which the fastener is applied the Web being composed ofinelastic threads in the longitw dinal direction of the length and ofelastic threads in the transverse direction of the no length,interlocking units arranged in series upon the edge of each length and aslider adapted to engage and disengage the units of the two lengths.

3. separable fastener comprising two material lengths of web fixed onthe margins of which the fastener is applied the web being composed ofthreads of yarn in the longitndinal direction of the length and ofelastic threads in the transverse direction of the 40 length,interlocking units arranged in series upon the edge of each length and aslider adapted to engage and disengage the units of the two lengths.

4. separable fastener comprising two Ina-- 5 terial lengths of web fixedon the margins of which the fastener is applied each length comprisingstrips inelastic in the longitudinal direction, at least one of thesestrips being elastic in the transverse direction, inter- 50 lookingunits arranged in series upon the edge of each length and a slideradapted to engage and disengage the units of the two lengths.

In testimony whereof I afiix my signature.

MAX BLASKOPF.

